In Futurama, How Hermes Requisitioned His Groove Back (season 2, episode 15), Bender loses his brain (which looks like a floppy disk), causing him to repeatedly say:
Bender: I am Bender. Please insert girder.
I'm a little confused, since the definition of "girder" is:
girder: A beam, as of steel, wood, or reinforced concrete, used as a main horizontal support in a building or bridge.
Yet Bender seems to be referring to his brain (or something similar). It's not clear how one could insert a girder into Bender.
Question: Why does Bender say "Please insert girder"?